github.com/aacfactory/fns@v1.2.85/commons/operators/map.go (about)

     1  /*
     2   * Copyright 2023 Wang Min Xiang
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   * 	http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   *
    16   */
    17  
    18  package operators
    19  
    20  import "context"
    21  
    22  func Map[S any, R any](ctx context.Context, src []S, fn func(context.Context, S) (R, error)) (dst []R, err error) {
    23  	dst = make([]R, 0, 1)
    24  	if src == nil || len(src) == 0 {
    25  		return
    26  	}
    27  	for _, s := range src {
    28  		d, mapErr := fn(ctx, s)
    29  		if mapErr != nil {
    30  			err = mapErr
    31  			return
    32  		}
    33  		dst = append(dst, d)
    34  	}
    35  	return
    36  }
    37  
    38  func MapOne[S any, R any](ctx context.Context, src S, fn func(context.Context, S) (R, error)) (dst R, err error) {
    39  	dst, err = fn(ctx, src)
    40  	return
    41  }